Productivity System - Agile Board, Email, Bookmarks and Backlog

I'm trying to improve my system of productivity. My system of late has involved running my life from Gmail, which I'm quickly realizing is woefully inadequate. For one, when it makes me reactive - what shows up in my inbox gets my attention. (After writing that sentence, I turned off Gmail notifications on my phone, so this question has already been productive).

A second aspect that makes it inadequate involves how I would not work on things that aren't high priority in a given day. My approach until now has been to snooze the email until a certain point in the future. The natural problem with this is I might snooze the number of days too early so I'll see the thing I should be doing before I should work on it or too late, in which case I'll see it after I should.

I think the solution to this is to use an Agile board for my tasks like I do at work. I'll have a lane for tasks I'm doing, one for "Done" and a backlog.

I've also recently been working on embracing the Just One Thing approach. I've struggled with trying to get too many things done and what invariably happens is I prioritize the easy tasks or tasks I want to do rather than the most important ones. By only having one thing to do in "Doing", I leave myself no wiggle room to procrastinate.

Does this system make sense? Is using Agile for oneself the best approach? I understand different things work for different people, but I'm really interested in a system that orients me towards important work and makes it hard to procrastinate.

The second part of this question involves the backlog of things to do. There are quite a few, some of which I will probably never get to for lack of time. What's a good method for clearing these? I'm thinking everything in the backlog is deleted after existing for X amount of time (e.g. 2 months). If it really is important, I will think to add it back to the backlog again.

Relatedly, I have a ton of bookmarks in Chrome with all sorts of wonderful material, including some from Taro. Again, the problem is between work, side-projects, fitness and life, I don't think I'll ever get to the vast majority of them, because watching and reading is consuming and usually the most important thing I can be doing is producing (coding or writing). I'm thinking of just deleting all these bookmarks because they present a temptation of how I should be spending my time.

An alternative is just to try and keep the most important ones (e.g. right now I have 100 bookmarks, and one can argue I should only ever have 20), but this means I have to go through and try and stack rank them against each other - a task of its own and not an easy one. Deleting them all is a one-time painful option, but actually the easiest one.

Happy to get people's insights!